Circuit-coupling for electrical apparatus.



F, E. CARLSON & J. F. LAMB CIRCUIT COUPLING FOR ELECTRICAL APPARATUS.

APPLICATION FILED MAY 24, \9I6.

Patented June 18, 1918.

I N V EN TORS. Frederick? [hr/.9071: Joseph 1 Lamb.-

WITNESSAS:

FREDERICK 1E. CARLSON AND J$EPH F. LAMB, OF NEW BRITAIN, CONNECTICUT, ASSIGNQRS TU LANJDJEES, FEARS? & CLARK, OF NEW BRITAIN, CONNECTICUT, A

COEPORATIQN 01E CONNECTICUT.

CIRCUIT-CUUPLING FOE, EILEUTRICAJL APPARATUS.

specification of Letters Patent,

Patented aims is, tare.

Application filed May M, 1916. Serial No. 99,69t.

Z '0 all whom it may concern:

Be it known that we, FREDERICK E. CARL- soN and JOSEPH F. LAMB, citizens of the United States, andresidents of New Butain, in the county of Hartford, State of Connecticut, have invented certain new and useful Improvements in Circuit-Couplings for Electrical Apparatus, of which the following is a specification.

This invention relates to a coupling for tlse with utensils which are likely to be handled by the conducting cords, and the object of the invention is to so connect the cords with the utensils as to permit of the circuit being broken at the utensll, but so arrange the connection as to prevent a complete disengagement of the parts. Other objects of the invention, and particularly the novel construction and arrangement of the parts will be more particularly pointed out in the following specification and claims.

. In the drawings- Figure 1 is an end view of the utensil. Fig. 2 is a central vertical section on the line 22 of Fig. 1.

Fig. 3 is a central vertical section on the line 33 of Fig. 1.

Referring to the drawings, a denotes the stem of a utensil, such as the immersion heater shown, through which the resistor terminals 2, 2, are carried and-exposed at the end of the hub 19. 0 is a thimble fitting onto the end of stem and flared at its upper end to provide a shoulder d on which fits the base 5 of suitable insulating material, such as porcelain, to the underside of which .are secured the spring contacts 6, 7, held apart by an insulating spacer 8, and making electrical contact with the terminals 2,2.

Upstanding from the base is a binding post 10 connected with one spring contact 6, and a member of a circuit coupling, as the plug 11, which is connected with the other spring contact 7.

To the binding post 10 one circuit wire 15 is secured, the parts and connection being protected by an insulating sleeve 16. A shell 20, apertured in its closed end in alinement with the plug 11 and also to receive the sleeve 16, incloses the base 5 and is secured in position as by the screws 21 which extend through the base and are threaded into the upper end of the stem. Springs 25,

between the end of the sleeve and the base, insure direct contact between the springcontacts 6, 7, and the terminals, 2, 2.

To the end of the circuit wire 17 there is secured the complementary member of a circuit coupling, such as the plug socket. 18, which may be freely connected with and disconnected from the plug 11 to make or break the circuit.

From consideration of this structure it will be seen that the circuit wires are in fact permanently connected with the utensil so that as the utensil is being handled, which is often done by grasping the circuit wires, there is noopportunity for it to become entirely disengaged from the circuit wires so that it might drop and be seriously damaged. Yet at the same time the circuit may be broken at the utensil by disconnecting the coupling members 11, 18, and furthermore it will be noted that when the utensil is connected up into circuit with the wires, the points of connection are entirely concealed, thus eliminating any possibility of the user being shocked.

The construction here illustrated and described is an extremely simple one, practical and economical to manufacture, and meets a situation which at the present time is a subject of considerable annoyance to users of electrical utensils of various kinds.

In accordance with the provisions of the patent statutes we have described the principle of operation of our invention, together with the apparatus which we now consider to represent the best embodiment thereof; but we desire to have it understood that the apparatus shown is only illustrative, and that the invention can be carried out by other means.

We claim as our invention 1. In a hand port-able electrical utensil, resistor terminals, a binding post electrically connected to one of said terminals, a member of a slip joint electrical coupling connected to the other terminal, in combination with circuit wires one of which is fastened to said binding post, and a complementary member of the slip joint coupling attached to the end of the other circuit wire.

2. In a hand portable electrical utensil, resistor terminals, a binding post electrically connected to one of said terminals, a removable sleeve of insulating material surof the other circuit wire.

3. In a hand portable electrical utensil, resistor terminals, a binding post electrically connected to one of said terminals, a member of a slip joint electrical coupling connected to the other terminal, in combinatlon with circuit Wires one of which is fastened to said binding post, a complementary member of the slip joint coupling attached to the end of the other circuit wire, anda sleeve of insulating material surrounding sa1d member.

4. An electrical appliance, a binding post connected to one terminal thereof, a member of a detachable coupling connected to the other terminal thereof, a sleeve of insulating material surrounding and protecting said bindin post, and an inclosing shell fitting over sai sleeve and apertured opposite said coupling member.

5. An electrical appliance having its terminals exposed, a base mounted and supported by said appliance, contacts on said base adapted for electrical connection with said terminals, a binding post mounted on said base and connected with one contact, and a member of a slip joint electrical coupling mounted on said base and connected with the other terminal.

6. An electrical appliance having its terminals exposed, a base mounted on and supported by said appliance, contacts on said base electrically connected with said for minals, yielding means acting upon said base to maintain the connection between said ontacts and terminals, a binding post mounted on the base and connected with one contact, and a member of a slip joint electrical connection mounted on said base and connected with the other contact.

7. A current translating device having its terminals exposed, a thimble located on said device and surrounding said exposed terminals, a base fitting within said thimblc, contacts undersaid base adapted for connection with said terminals, terminal posts above said base electrically connected with said contacts, and yielding means acting on said base to press said contacts on to said terminals.

8. A current translating device having its terminals exposed, a thimble located on said device and surrounding said exposed terminals, a base fitting within said thimble, contacts under said base adapted for connection with said terminals, terminal posts above said base electrically connected with said contacts, a closed end shell surrounding said posts and apertured in line therewith, means for securing said shell in place, and yielding means between said shell and base to press the latter toward said terminals.

' FREDERICK E. CARLSON.

JOSEPH F. LAMB. 

